Sound transmitting apparatus



A. E. COY.

SOUND TRANSMITTING APPARATUS.

APPLICATION HLED June, 1916.

1,230,281 w Patented June 19, 1917.

fiier'i E. C30

UNITED STATES PATENT OFFICE.

ALBERT E. GOY, OF CHICAGO, ILLINOIS, ASSIGNOR, TO THE MAGNIPHONE COMPANY, A CORPORATION OF ARIZONA.

SOUND-TRANSMITTING APPARATUS.

To all who m tt may concern:

Be it known that I, ALBERT E. Cor, a citizen of the United States of America, and a resident of Chicago, in the county of @ook, State of Illinois, have invented certain new and useful Improvements in Sound-Transmitting Apparatus, of which the following is a specification.

This invention relates to electrical sound transmitting apparatus, and is a uLVlSlOl'l of my prior application for a patent SerialNo. 861,553, filed September 14,1914;

The object of the present improvenn-mt ifs -.Ol like conductive material, formed with a to provide a structural formation and association of parts adapted to attain in a ready and accurate manner the desired degree or amplitude of the vibrations of the dia phragm of a sound transmitting apparatus, and with which increased purity and distinctness in the sound transmitted is effectively attained, with an avoidance of harsh or grating tones in one case, and the attainment of a distinct transmission of soft and low tones in the other case, all as will hereinafter more fully appear.

In the accompanying drawings Figure 1 is an enlarged longitudinal section on line wa, Fig. 1.

Fig. 2, is a sectional elevation on line a" m, Fig. 2. Similar reference numerals indicate like parts in both views.

Referring to the drawings, 1 designates the transmitter shell or casing, preferably of the shallow cup form shown, and provided with the usual closure cap or cover 2, the marginal portion of which is provided with a screw-threaded formation adapted for engagement with a correspondingly formed portion of the shell 1.

3 designates a centrally disposed cluster of small apertures formed in the cap 2, for the passage of the sound waves to the trans mitter diaphragm of the structure.

' 4: designates an annular rim or neck on the cap 2 for the attachment of a sound collector or mouth piece 4 preferably of a cylindrical form as shown.

5 designates the transmitter diaphragm preferably of the flat disk form shown.

6 designates a cup-shaped skeleton carrying frame or spider formed with a marginal recess for the reception of the marginal portion of the diaphragm 5, which is secured in said recess by a marginal confining ring 7,

Specification of Letters Patent.

Patented June 19, 1917.

Divided and this application filed July 8,

the parts being connected together by connecting screws or other usual means.

6 designates the central portion of the skeleton frame 6 aforesaid, formed with a central opening for the passage of the here inafter described microphone member. In the preferred construction shown, said central portion 6 and the annular marginal portions of the skeleton frame 6 are integra lly connected by radial arms 6 as shown in Fig. 1.

8 designates a microphone block of carbon peripheral positioning flange 9 at one end, and with a plurality of cells or recesses 10 in its front face for the reception of granules of carbon by which microphone prop erties are imparted to the structure, as usual in the present type of transmitters. Said microphone block 8 projects through the orifice of the central portion 6 of the skeleton frame 6, without electrical contact therewith, and is secured in insulated relation to the head 6 by an interposed insulating washer 11, a binding cap 12 of con ductive material, and insulated binding screws 13, as shown in Fig. 1.

1st designates a contact finger attached to the transmitter shell 1, with its free end bearing against the binding cap 12, and adapted to electrically connect the micr0- phone block 8 with a terminal member 15 of the transmitter shell 1. A companion contact finger, (not shown) will electrically connect the marginal portion of the skeleton frame 6 and diaphragm 5 with a com panion terminal member of the transmitter shell.

The structure so far described is similar to that shown in my aforesaid application, Ser. No. 861,553, and no claim is made in this case to any of such structural features.

In the present improvement, 16 desig nates a plurality of resilient damper fingers pivotally mounted on the marginal confining ring 7 of the transmitter diaphragm 5, with their free ends in constant contact with the face of the diaphragm and adapted to be manually shifted toward or from the central portion of said diaphragm, to increase or diminish the damping action as required. A simultaneous adjustment of the aforesaid damper fingers 16 is preferably attained by gear formations 17 on the respective fingers and having operative engagement with each other as shown.

18 designates a handle on one of the damper fingers 16 for the convenient manual adjustment of the mechanism.

Having thus fully described my said invention What I claim as new and desire to secure by Letters Patent, is

. 1. In a sound transmitter of the type de scribed, the combination of a diaphragm, damping means adapted for contact with said diaphragm, a casing, an aperture in said casing, a handle connected through said aperture With said damping means, said handle being adapted for moving said damping means back and forth upon the diaphragm, substantially as set forth.

2. In a sound transmitter of the type herein described the combination of a diaphragm, a plurality of damping means pivotally arranged adjacent to the'margin of the diaphragm With their free ends adapted for contact With said diaphragm and one common means for moving said plurality of damping means back and forth upon the diaphragm, substantially as set forth.

3. In a sound transmitter of the type herein described, the combination of a diaphragm, a plurality of damping means pivotally arranged adjacent to the margin of the diaphragm with their free ends adapted for contact With said diaphragm and ad justable to and from the central portion of said diaphragm, and means for imposing simultaneous movement on said plurality of damping means, the same comprising gear formations associated With the pivot portions of said damping means, substantially as set forth.

Signed at Chicago, Illinois, this 6th day of July, 1916.

ALBERT E. COY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

